I've finally managed to better understand the issue and here is a step-by-step guide.
First things first: the problem is related to file security and your user login access rights. When the non volatile memory file is first created as a normal user, it will be fine. However when the non volatile memory file is first created when running as-admin, it won't have your user account access rights therefore it won't be accessible by the trainer when you run as a normal user.
add your user accounts read and write access rights
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